What does 'object outside tetrahedral volume' mean?

Light Probes form a tetrahedralized network. If a renderer's bounds center is outside the network, it samples the closest probe with no interpolation — lighting may pop and warning fires. Add boundary probes that enclose every renderer.

How dense should boundary probes be?

One probe at each corner of your level, plus a few along long edges. Corners are the most likely failure points because tetrahedralization can leave gaps.

Visualize the network?

Window → Rendering → Lighting → Light Probe Visualization. Scene view shows tetrahedra. Toggling Show Tetrahedra reveals where the network covers and where it doesn't.

Fix: Unity Light Probe Bake Out of Volume Warning

Quick answer: Add boundary probes at level corners and along edges so the tetrahedral network fully encloses every renderer. Use Light Probe Visualization to confirm coverage.

Console warning: “Renderer is outside the Light Probe Group’s tetrahedral volume.” Renderer’s lighting jumps when crossing the boundary.

The Symptom

Specific renderers (objects near level corners) trigger warnings. Their lighting may pop or use stale values when they move.

The Fix

Open the Light Probe Group. Edit Probes button. Add probes at every corner of your level’s rough bounding box, plus mid-points on long edges.

Boundary probe placement (typical level):
  - 8 probes at corners (level cube)
  - 4 probes at mid-points on top edges
  - 4 probes at mid-points on bottom edges
  Plus interior density per light contrast region

Re-bake. Network now encloses everything. Warnings disappear.

Visualization

Window → Rendering → Lighting → Light Probe Visualization → Show Tetrahedra. Scene view renders the tetrahedral mesh. Move a test object; it should always sit inside a tetrahedron.

Verifying

Re-bake. Console clear of out-of-volume warnings. Move objects to corners; lighting interpolates instead of popping.

“Boundary probes. Visualize. Re-bake. Network covers.”

Related Issues

For light probe seams, see probe seams. For lightmap banding, see lightmap banding.

Probes at edges. Network covers level.